Improvement in grain-screens



1.- El ANDERSON.

Grain Screen.

I Patented Sept. 28, 1869.

NJETiRs, PHOTO'LITMOGRAPHER WASHINGTON fistrnt dbfijiirr.

diluted swa JOHN E. ANDERSON, or BOILING SPRINGS, PENNSYLVANIA.

Letters Patent No. 95,303, dated isqitember 28, 1869,

IMPROVEMENT 11v Guam-SCR ENS,

The Schedule referred to in these, Letters Patent and making part of the same,

. To all whom it may concern:

nying drawings, and to theletters of reference thereon,

Figure l is a central vertical section, on line a: xof fig. 2, showing the conduit for the induction ofthe grain to be cleaned, the hood at the upper end of the screen, and the arrangement of the mechanism for moving such screen.

Figure 2 is a plan or top view of the screen, and the mechanism for moving the same.

Corresponding letters refer to corresponding parts in both of the figures.

This invention relates to that class of devices used for cleaning grain, and is designed as an improvementupon the one for which a patent was issued to me on the 27th of- October, 1868; I

My present invention consists of a curved hood, placed at the upper end of the screen, to prevent the waste of grain atthat point and it further consists in the provision for imparting a compound movement to the screen, and in the arrangement of devices for pass-' ing currents of air through such screen, as will be more.

fully explained hereinafter.

A, in the drawings, represents that porti'onof the frame-work of the machine which surrounds the screen,

which may be constructed as shown in the drawing, or-

in any other approved form.

B represents a conduit, which leads from the grainheating apparatus, not shown in this application, but which isattached to the upper portion of the screen, as shown in fig. 1 of the drawings. I

O 0 represent the screen, which is to be constructed in the form shown in fig. l, being a'successionof steps from the lower to the upper end, so that as the grain falls from .one step to another, it is met by a current of air, and thus any dust or chaff, which maybe mingled therewith, may be carried through the outlet a at the upper end of said screen.

0 represents an inclined air-conduit, which is to be placed or formed directly above the screen, as shown The current of air which is to pass through this conduit is to be furnished by an ordinary fan-wheel, which is to be located so as to direct such current into such conduit.

D represents a hood or cap, which consists of a curved piece of metal, or it :may be of any other suitable material, and of the form shown in fig. '1, which .i extends across the machine at one of its ends, it being so arranged as to receive upon its concave surface thecurrent of air which passes through the conduit 0, and 'conducts it to the outlet (1.

It will be seen, that as the grain to be cleaned enters the conduit 0, it comes directly in contact with the current of air, which is at the time passing through such conduit, such current having a tendency to carry up the grain out at the upper end, which result is prevent-ed by the curved form ofthehood, the outer edge of which gives the grain a downward direction, thus" causing it to fall upon the upper step of thescreen,

while'the dust and chafi' are, by the force" of the current of air, carried out through aperture a.

. D D represent a series of rods, which pass through the space between the concave side of the hood and the screen, for the purpose of checking any kernels of grain which are carried up to that point by the force of the current, and causing them to fall back upon the screen, they serving, at the same time, to remove any dust from the grain that may adhere to it when it comes in contact withsuch rods.

E represents an abutment, which is to be placed just outside of the edge of the hood D, its upper edge projecting somewhat above such edge, so that a passage, a, is left between the two for the passage of the dust and chaif, as above described.

F. F represent sheets of metal, which'are to be secured to the frame-work of the screen in -such a inanner as to leave air-passages between them, and another sheet of metal, which is also to be secured to said frame-- work, and at such an angle as to form the upper surface of the passages ffishown infig. 1.

The object, of the passages is to provide for the discharge ofany substances foreign to the graiirtobe cleaned, such as cockle, chess, seeds of weeds, and any dust whichmayhavc descended to. such points with the grain.

The red arrows in the drawings show that a portion of the air, which is forced through conduit 0, will pass out through such aperture, and it follows that the result above described will be accomplished.

G represents the partitionor plate which forms the upper surface of the conduit'O, such partition entend-v ing across the machine from side to side. i

H represents a crank-shaft, which has its bearings in boxes in the lower portion of the frame.

This crank has upon it two cam-formations, H H, which, as said crank is rotated, come in contact with the under side of the frame to which the screen is attached, and near the lower end thereof, so that a vertical reciprocating motion is imparted to the lower end of such frame. a

I represents a connecting-rod, to. be attached, by I means of any suitable joint, to the crank H, its opposite end extending and being pivoted to a vertical arm, K, which extends downward from the rock-shaft K, which rests in bearings formed in the side of the machine, and from which extend upwards an arm, the upper end of which is bifurcated, to embrace a pin or pins attached to the upper portion of the frame which supports the screen.

It will be seen that this arrangement of devices will give to the upper end of the screen a longitudinal motion, at the same time that the crank H is imparting to the lower portionthereof a vertical reciprocating movement, which combined movement has been found very beneficial in preventing the lodgemeut of grain upon the screen.

Motion may be imparted to this crank by means of a pulley, which is secured toits outer end, over which passes a belt, which may be driven by a pulley upon the fan-shaft, or from any other revolving part of the machine.

Having thus described my invention,

What I claim, and desire to secure by Letters Patent, is-- 'rock-shaft, for giving the compound motion to the screen, substantially as and for the purposespecified. In testimony whereof, I have signed my name to this specification, in the presence of two subscribing wit nesses.

JOHN E. ANDERSON.

\Vitnesses:

JOHN HARRIS, DAVID 'STERRETT. 

